iOS 11.4.1 (build 15G77) is an official Apple over-the-air update for the iPhone 6+, released on 2018-07-09T17:09:45Z. The update package is 275.87 MB. This is a delta (partial) update that requires 11.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 283e28be44e17ffce3b097a557531f010991f88f.zip.